Teaching objectives:

1. Let students learn to describe things around them with numbers and communicate with people.

2. Cultivate the consciousness and ability to look at things around you from a mathematical perspective and analyze various phenomena in daily life from a mathematical perspective.

3. Experiencing the quantitative thought initially and promoting the development of number sense.

Key points and difficulties:

Size comparison of numbers with the same number of digits.

Teaching AIDS:

Courseware, counter, ruler.

Teaching process:

First, check the import.

relative dimension

98 1() 1000、6980()789、7083()7208、 1378()234 1、2980()3408、3920()3980

Second, give it a try.

1, the courseware shows 28 pages of situation map, observe it carefully and give it a try. The teacher patrolled and found problems.

2. The booth shows the tasks completed by the students themselves.

3. Student report: Mark the reasons for the price of three kinds of bicycles on the digital line and tell which one is the most expensive.

Third, teacher evaluation,

Teachers should affirm students' different opinions as long as they are reasonable.

Design intention: Improve students' sufficient and independent thinking space, enhance students' inquiry consciousness and self-confidence in learning, and let students experience the fun of success. )

Fourth, group discussion and study.

Learn to mark the approximate location of 3200 on the internet, discuss and study in groups, and then report.

Verb (abbreviation of verb) courseware display

Practice, complete exercise questions 3 and 4 on page 29, let the students fill them in, and the teacher will inspect them.

Sixth, summarize and improve.

Let the students talk about the harvest, focusing on how to compare the numbers.

Blackboard design:

give it a try

Relative to the size of the number within 10,000, the number with more digits is larger, and the digits are the same, starting from the high position.

Mathematics Courseware for Grade Two in Primary School Volume II: "Compare with One"

Teaching objectives:

1, through comparison activities, master the method of comparing the sizes of numbers within 10,000, and be able to express the sizes of numbers within 10,000 with symbols.

2, through the estimation, combined with real materials, feel the significance of large numbers, and realize the practical role of estimation in real life.

Teaching preparation:

Teacher: Digital card,

Student: Digital cards within 100.

Teaching process:

First, review.

1, use digital cards within 100 at the same table, and each person will draw one at a time. Whoever says the big number first wins.

2. Exchange experience in judging large numbers.

Second, new funding.

1, teach "comparison"

(1) Let me see 1084 and 982. Tell me who is older and who is younger.

(2) Students say that three digits are less than four digits, so1084 > 982

(3) The teacher shows some other figures and the students compare them.

(4) summarize the law:

Digital comparison:

(1) The more digits, the greater the number.

(2) Compared with bits, the number of bits is larger (the number of bits is the same)

(3) If the number of digits is the same as the number of digits, let's compare the next digit.

2. practice.

(1) Students complete P36, fill in O, =

(2) Tell me why you filled in this way.

Step 3 give it a try

(1) Teachers guide students to read the questions and understand their meanings.

(2) Tell me how to compare sizes quickly.

(3) Teacher's summary:

Divide these numbers by digits first, and then compare them with the same number.

99 & lt345 & lt387 & lt809 & lt 1725<4300

Step 4 think about it

(1) Guide reading and understand the meaning of the question.

(2) The smallest four digits are 1000 and the smallest four digits are 9999.

5, math games:

(1) Tell your deskmate what number you wrote. ...

(2) Ask a student to give a demonstration on stage, and then the whole class will do it in groups.

6. practice.

Complete exercises 1 and 2.

Three. abstract

What did the students learn in this class?

1, learned to compare the sizes of numbers within 10,000.

2. How to compare four digits with three digits?

3. How to compare numbers with the same number?

4. How to compare many numbers together?

Fourth, homework

1, the smallest four digits are (), and the four digits of are ().

2. The smallest three digits are (), and the three digits of are ().

3.287,7650,80,285, 165 1 79 Among these figures, two digits have (), three digits have () and four digits have ().